This 1 inch wide ceramic tape is used to wrap your heater block and reduce heat transfer to both the extruder and your work piece. Fix by wrapping in kapton tape.
The tape on your Makerbot, MBot3D or Reprap will need replacing from time to time, especially when a print fails and the melted plastic gets caught up in the print head - it can sometimes stick to the ceramic tape and rip it on removal - careful not to pull on the temperature sensor wire!

All prices are in Australian Dollars and include GST. Standard Postage & Handling with Australia is $12 flat rate, free for orders over $350. Express Post starts at $14